I learned this from Technorick on the FR3 forum and it works great. Buy a 3/4" to 1/2" nylon male to male union. I paid $1.36 at Menards. The 3/4 end matches a garden faucet; the 1/2 matches a hand held shower head.
Screw the 3/4 into your fresh water tank fill, remove the head from your outside shower and screw the hose onto the 1/2 end. Then go to your winterizing hose, open the valve on the hose and insert the end into your water jug. Turn on the water pump and open the outside water shower. The pump will suck the water out of the jug; push it through the RV plumbing, out the outside shower and into the water tank.
I use this method at the storage lot to push bleach solution into my tank when I sanitize. The day before we leave I pump 3 or 4 gallons into the tank and run the faucets until I can smell some bleach. I let it sit overnight and slosh around on the way, then drain and flush it thoroughly at the campground. It works like a champ.
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2009 FreeLander - Retired
2015 FR3 30DS - Retired
2023 Sunseeker 2440DS
Towing 2016 Chevy Sonic LT
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